Doraemon: Gadget Cat from the Future

It's the End of the World As We Know It (2x27)

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In a retelling of the story of Noah's Ark, the best friends Doraemon and Noby see a vision in Doraemon's Second Sighters of the world being destroyed in an apocalyptic flood that very night, and set about building a gigantic boat despite jeers from family and friends.